Debian netinst may skip static IP config

The Debian 13 netinst installer may not offer manual network configuration and silently assigns DHCP. Configure static IP post-install via /etc/network/interfaces.

After install, edit `/etc/network/interfaces` to replace `iface ens18 inet dhcp` with a static block. Also purge `dhcpcd-base` — it overwrites `/etc/resolv.conf` with an empty file on reboot when no DHCP server responds to the static IP.\n\nDiscovered during Docker VM deployment (2026-03-23).

Affected entities:VM 200 — Docker